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Doom engine closely-compatible with vanilla doom

Chocolate Doom aims to accurately reproduce the original DOS version of
Doom and other games based on the Doom engine in a form that can be
run on modern computers. Unlike most modern Doom engines, Chocolate Doom
is not derived from the Boom source port and does not inherit its
features (or bugs).

Originally, Chocolate Doom was only a Doom source port. The project
now includes ports of Heretic and Hexen, and Strife.

Chocolate Doom requires game data to play. Commercial game data can be
packaged using "game-data-packager". Chocolate Doom supports all flavors
of Doom, including The Ultimate Doom, Doom 2 and Final Doom as well as
Chex(R) Quest and HACX. Heretic, Hexen and Strife are supported by
Chocolate Heretic, Chocolate Hexen and Chocolate Strife, respectively,
which are also included in this package.